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我收到一些表格,其中有鏈接列表分組的元素,我無法處理它。Access 2007通過鏈接列表改善查詢/ vba到組
這個函數可以找到它,但是我經常被問到自從任務調度程序啓動後它的宏在哪裏,或者有一些內存問題。
我使用下面的代碼來找出idGroup(翻譯成英文),我想知道是否會通過改進方法來改進它,特別是它的速度,因爲它需要長達一個小時的30 000行和大約2500組......(這就是爲什麼我用VBA看到進展...)
'Simple example
'idGroup,id2,id1
'6338546,14322882,13608969
'6338546,13608969,13255363
'6338546,6338546,14322882
'6338546,11837926,11316332
'6338546,12297571,11837926
'6338546,13255363,12811071
'6338546,12811071,12297571
'6338546,7610194,7343817
'6338546,7935943,7610194
'6338546,8531387,7935943
'6338546,6944491,6611041
'6338546,7343817,6944491
'6338546,9968746,9632204
'6338546,10381694,9968746
'6338546,6611041,0
'6338546,8920224,8531387
'6338546,9632204,8920224
'6338546,11316332,10941093
'6338546,10941093,10381694
Public Function GetidGroup()
'first id1 is always 0
sql = "SELECT idGroup, id2, id1 FROM TABLE_WITH_LINKED_LIST WHERE id1='0' ORDER BY id2 DESC"
Dim rs As Recordset
Dim uidLikedList As String, id2 As String, id1 As String
Set rs = CurrentDb.OpenRecordset(sql)
Dim total As Long
Dim idGroup As String
Dim incrément As Long, progress As Double
total = rs.RecordCount
incrément = 1
While Not rs.EOF
progress = Math.Round(100 * incrément/total, 2)
'Print in order to avoir freezing
Debug.Print progress
If rs.Fields("idGroup") = "" Then
id2 = rs.Fields("id2")
idGroup = precedentUid(id2)
rs.Edit
rs.Fields("idGroup") = idGroup
rs.Update
End If
incrément = incrément + 1
rs.MoveNext
Wend
rs.Close
Set rs = Nothing
GetidGroup = total
End Function
'Recursive function
'Deepest so far is about 62 calls
Public Function precedentUid(id2 As String) As String
sql = "SELECT idGroup, id2 FROM TABLE_WITH_LINKED_LIST WHERE id1 = '" & id2 & "'"
Dim rs As Recordset
Dim precedentid2 As String
Dim idGroup As String
Dim ret As String
Set rs = CurrentDb.OpenRecordset(sql)
If rs.EOF Then
rs.Close
Set rs = Nothing
precedentUid = id2
Else
'Some records have several references
'56 impacted records :
'TODO : Give the min id2 to the group
ret = "-1"
While Not rs.EOF
If rs.Fields("idGroup") = "" Then
precedentid2 = rs.Fields("id2")
idGroup = precedentUid(precedentid2)
If ret = "-1" Or CLng(ret) > CLng(idGroup) Then
ret = idGroup
End If
'Debug.Print id2 & " " & precedentid2 & " " & idGroup
rs.Edit
rs.Fields("idGroup") = idGroup
rs.Update
End If
rs.MoveNext
Wend
rs.Close
Set rs = Nothing
precedentUid = ret
End If
End Function